#pragma once

#include <iostream>
#include <string>
#include <functional>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "Log.hpp"
#include "inetAddr.hpp"

const int defaultfd = -1;

using namespace LogModule;
using func_t = std::function<std::string(const std::string&, InetAddr&)>;

class UdpServer
{
public:
    UdpServer(uint16_t port, func_t func)
        : _sockfd(defaultfd),
          //_ip(ip),
          _port(port),
          _isrunning(false),
          _func(func)
    {

    }

    void Init()
    {
        // 1. 创建套接字
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if(_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket error!";
            exit(1);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd :" << _sockfd;

        // 2. 绑定socket信息，ip和端口，ip(比较特殊，后续解释)
        // 2.1. 填充sockaddr_in结构体
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        //我会不会把我的IP地址和端口号发送给对方
        //IP信息和端口信息，一定要发送到网络
        //本地格式->网络序列
        local.sin_port = htons(_port);
        //IP也是如此， 1. IP转成4字节 2. 4字节转成网络序列 -> in_addr_t inet_addr(const char *cp);
        //local.sin_addr.s_addr = inet_addr(_ip.c_str());
        local.sin_addr.s_addr = INADDR_ANY;
        int n = bind(_sockfd, (struct sockaddr*)&local, sizeof(local));
        if(n < 0)
        {
            LOG(LogLevel::FATAL) << "bind error";
            exit(2);
        }
        LOG(LogLevel::INFO) << "bind success, sockfd: " << _sockfd;
    }

    void Start()
    {
        _isrunning = true;
        while(_isrunning)
        {
            char buffer[1024];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            // 1. 收消息
            ssize_t s = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr*)&peer, &len);
            if(s > 0)
            {
                // int peer_port = ntohs(peer.sin_port);
                // std::string peer_ip = inet_ntoa(peer.sin_addr);
                InetAddr client(peer);

                buffer[s] = 0;
                std::string result = _func(buffer, client);
                //LOG(LogLevel::DEBUG) << "[" << peer_ip << ":" << peer_port << "]#"<< "buffer: " << buffer; // 1. 消息内容 2. 谁发的

                // 2. 发消息
                //std::string echo_string = "server echo@ ";
                sendto(_sockfd, result.c_str(), result.size(), 0, (struct sockaddr*)&peer, len);
            }

        }
    }

    ~UdpServer()
    {}

private:
    int _sockfd;
    uint16_t _port;
    //std::string _ip; // 用的是字符串风格， 点分十进制， “192.168.1.1”
    bool _isrunning;
    func_t _func;
};